Move GarageBand for Mac &lpar;v10.x&rpar; from your Applications folder to the Trash. You may be asked to enter an administrator password.

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From the top level of your hard drive, open the Library folder, then open the Application Support folder. Drag the GarageBand folder to the trash. You may be asked to enter an Administrator password.

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You'll need to empty the Trash, but first make sure that you don't have anything else in the Trash that you want to keep. Remove any items that you want to keep, then empty the Trash &lpar;choose Finder > Empty Trash&rpar;.

After installation is complete, open GarageBand and allow the basic content to download and install. You may be asked to enter an administrator password.

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Quit GarageBand, then return to the Mac App Store and make sure that you're signed in with the Apple ID you used to purchase GarageBand for Mac &lpar;v10.x&rpar;.

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Click Purchases in the Mac App Store toolbar, then look for GarageBand &lpar;without a version number&rpar; in the list of purchased apps. If you don't see it in the list, make sure it's not hidden.

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Click Install to download and install GarageBand for Mac &lpar;v10.x&rpar;. GarageBand '11 &lpar;v6.0.5&rpar; will be moved to a folder named GarageBand '11 &lpar;v6.0.5&rpar; in your Applications folder.

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If you previously purchased additional content for GarageBand, open GarageBand and choose Restore Purchase from the GarageBand menu.